Lua APA (7ú heag.)

Houghton, P. (2002). Nine descents of the spirit: Towards inner harmony. Jessica Kingsley.

Lua i Stíl Chicago (17ú heag.)

Houghton, Peter. Nine Descents of the Spirit: Towards Inner Harmony. London ; Philadelphia: Jessica Kingsley, 2002.

Lua MLA (9ú heag.)

Houghton, Peter. Nine Descents of the Spirit: Towards Inner Harmony. Jessica Kingsley, 2002.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.